Between the ROG Phone 9 and Xiaomi 15, the ROG Phone 9 comes out ahead in refresh rate and ram, while the Xiaomi 15 wins on wireless charging and wired charging. Overall, the ROG Phone 9 scores 75.1 and the Xiaomi 15 scores 70 on our Mars Score.
Which should you buy?
The ROG Phone 9 edges ahead on the Mars Score (75.1 vs 70), but the 5.1-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the ROG Phone 9 if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. The biggest gaps in its favor are refresh rate, ram, battery capacity, among others.
Pick the Xiaomi 15 if you carry the device everywhere and weight or thickness has been the deciding factor before. Its strongest claims are wireless charging, wired charging, weight, among others.
Both ship with comparable main camera, 5g support, water resistance, so those specs don't separate the two — focus on the differences below.
Bottom line: the ROG Phone 9 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why ASUS - ROG Phone 9 wins
- ▲Refresh rate — 54.17% more. 185 Hz vs 120 Hz.
- ▲RAM — 33.33% more. 16 GB vs 12 GB.
- ▲Battery capacity — 7.41% more. 5800 mAh vs 5400 mAh.
- ▲Screen size — 6.60% more. 6.78 " vs 6.36 ".
- ▲Has Headphone jack.
Why Xiaomi 15 wins
- ▲Wireless charging — 233.33% more. 50 W vs 15 W.
- ▲Wired charging — 38.46% more. 90 W vs 65 W.
- ▲Weight — 35.00 g less. 192 vs 227.
- ▲Pixel density — 18.56% more. 460 ppi vs 388 ppi.
- ▲AnTuTu — 3.88% more. 2680000 vs 2580000.
- ▲Promised OS updates: 4 (vs 3).
Spec comparison
Design
| Spec | ASUS - ROG Phone 9 | Xiaomi 15 |
|---|---|---|
| Weight | 227 g | 192 glead |
| Thickness | 8.9 mm | 8.1 mmlead |
| Water resistanceⓘ | IP68 | IP68 |
| Form factor | bar | bar |
Display
| Spec | ASUS - ROG Phone 9 | Xiaomi 15 |
|---|---|---|
| Screen sizeⓘ | 6.78 "lead | 6.36 " |
| Pixel densityⓘ | 388 ppi | 460 ppilead |
| Refresh rateⓘ | 185 Hzlead | 120 Hz |
| Peak brightnessⓘ | 2500 nits | 3200 nitslead |
Performance
Cameras
| Spec | ASUS - ROG Phone 9 | Xiaomi 15 |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 32 MP | 32 MP |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | ASUS - ROG Phone 9 | Xiaomi 15 |
|---|---|---|
| Battery capacity | 5800 mAhlead | 5400 mAh |
| Wired chargingⓘ | 65 W | 90 Wlead |
| Wireless chargingⓘ | 15 W | 50 Wlead |
Connectivity
| Spec | ASUS - ROG Phone 9 | Xiaomi 15 |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | truelead | false |
| microSD slot | false | false |
Operating System
| Spec | ASUS - ROG Phone 9 | Xiaomi 15 |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 3 years | 4 yearslead |
Frequently asked
Which has better battery, ROG Phone 9 or Xiaomi 15?+
ROG Phone 9 has 7.4% more battery — 5800 mAh vs 5400 mAh.
Which is lighter, ROG Phone 9 or Xiaomi 15?+
Xiaomi 15 is 35g lighter — 227g vs 192g.
Is ROG Phone 9 waterproof?+
ROG Phone 9 has an IP68 rating.
Does Xiaomi 15 support 5G?+
Yes, Xiaomi 15 supports 5G.
Which has more RAM, ROG Phone 9 or Xiaomi 15?+
ROG Phone 9 offers 16GB of RAM.
Which has a better camera, ROG Phone 9 or Xiaomi 15?+
Xiaomi 15 has a 50 MP main camera vs 50 MP.
Spec-level deep dives
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